Okay, first impressions, it looks okay, but the crafting/name is not very good.

Instead of "Astroneer" (I mean, it IS in its own tab, so its Astroneer anyway) give them their full name, such as "Tungsten Carbide" and, aluminium alloy, etc.
You could get Organic from harvesting trees, or decomposing fish, maybe.
Add new ore generations: such as, Laterite, Saphrite, Resin, Compound, Quartz, etc.
Gas vents, when placed on top with something, gets you gas's of that type.
new machines like the Shredder, which can accept both Vanilla and the mod items for scrap :D.
power generators, like wind turbines, solar panels, array, and even..... the RTG :O
Vehicles maybe? like, how you could connect like a train, but drives like a car?.
TETHERS, YOU SHOULD ADD TETHERS AS A SMALL LIGHT SOURCE xD

and a lot more, >:)

NICE!!! The complete overhaul Mod will be very good... :) Im looking forward to start with this!

I thought a lot about creating new patches, gas and mining patches, every kind ... the machines ... Your tethers idea is the best actually, i see other mods that uses oxygen to maintain the engineer alive, we can get something from them...

Using alien biomes could make a feeling that we are in different planets moving though the map...

This mod as an Parallel Factory really limited what we can do because has to use the same "map" the player already playing and in the end generate some sciences... But it can generates complete different things, in a complete different gameplay... Soon as i have some time i wil start something!!!! XD

Thanks for the ideas DraLUSAD